P-1 factorer

[Troodon]

Input: sbfactor 6110000 6111000 [depth] [value] [mem]

If [depth]=48 and [value]<1.2 it gives this error (sbfactor 1.2 et 1.25.5):

B1=0 B2=0 Success=0.000000 Squarings=0
P-1 factoring doesn't make sense for this input.

If [depth]=47 it works fine with any [value].Could anybody please explain me why? Thanks!

Edit: Another question. Why sbfactor 1.25.5 gives a lower number of expected factors than sbfactor 1.2? (using the same parameters, of course).